P5: OO Inheritance.rb

class Vehicle
    attr_reader :status, :color, :wheels
    
    def initialize(args)
        @color = args[:color]
    end

    def drive
        @status = :driving
    end

    def brake
        @status = :stopped      
    end

    def needs_gas?(randomness = [true, false])
        return randomness.sample
    end
end

class Car < Vehicle
    @@WHEELS = 4
    
    def initialize(args)
        super
        @wheels = @@WHEELS
    end

    def needs_gas?
        super([true, true, false])
    end

end


class Bus < Vehicle
    attr_reader :passengers, :fare, :num_seats, :wheels
    
    def initialize(args)
        super
        @wheels = args[:wheels]
        @num_seats = args[:num_seats]
        @fare = args[:fare]
        @passengers=[]
    end

    def drive
        return self.brake if stop_requested?
        super
    end

    def admit_passenger(passenger,money)
        @passengers << passenger if money > @fare
    end

    def stop_requested?
        return [true,false].sample
    end

    def needs_gas?
        super([true,true,true,false])
    end
end


class Motorbike < Vehicle
    attr_reader :speed

    @@WHEELS = 2

    def initialize(args)
        super
        @wheels = @@WHEELS
    end

    def drive
        super
        @speed = :fast
    end

    def needs_gas?
        super([true,false,false,false])
    end 

    def weave_through_traffic
        @status = :driving_like_a_crazy_person
    end
end

# Car Class Driver code
puts 'The Lexus is rolling off the manufacturing line.'
lexus = Car.new({color: 'red'})
lexus.drive
p lexus.status == :driving 
lexus.brake
p lexus.status == :stopped
p "Does the car need gas? #{lexus.needs_gas?}"

# Bus Class Driver Code
puts ""
puts 'The greyhound bus is being created: '
greyhound = Bus.new({color: 'grey', wheels: 8, num_seats: 50, fare: 2})
# Both these work: initializing with argument parameters and with a hash
# Why do both of them work the same? 
# greyhound = Bus.new(color: 'grey', wheels: 8, num_seats: 50, fare: 2 )

p greyhound.fare.class == Fixnum
greyhound.admit_passenger('Eric', 20)
p greyhound.passengers[0] == 'Eric'
bus_status = greyhound.drive
puts (bus_status == :driving || bus_status == :stopped)
p greyhound.brake == :stopped
p greyhound.stop_requested? != nil
p greyhound.needs_gas? != nil


# Motorbike Driver Code
puts ""
puts 'The Ducati is careening down the highway.'
ducati = Motorbike.new({color: 'blue'})
ducati.drive
p "The Ducati is speeding through the red light district, it's #{ducati.status} and it is going really #{ducati.speed}!"
p "The Ducati hit a red light. It is now #{ducati.brake}."
p "The Ducati has been driving for awhile. Does it need gas? #{ducati.needs_gas?}."
p "The Ducati is being chased by police! He's now #{(ducati.weave_through_traffic).to_s.gsub('_', ' ')}!"